package com.company.common.function.netty.netty1;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;

/**
 * 搭建一个Netty服务器
 * 启动类（负责启动(BootStrap)和main方法）
 * ChannelHandler(负责具体的夜晚逻辑)
 */
//Netty服务器启动类
public class HttpServer {
    private final int port;

    public HttpServer(int port) {
        this.port = port;
    }

    public static void main(String[] args) throws Exception {
        if (args.length != 1) {
            System.err.println("Usage" + HttpServer.class.getSimpleName() + "<port>");
            return;
        }
        int port = Integer.parseInt(args[0]);
        new HttpServer(port).start();
    }

    public void start() throws Exception {
        ServerBootstrap b = new ServerBootstrap();
        NioEventLoopGroup group = new NioEventLoopGroup();
        b.group(group).channel(NioServerSocketChannel.class)
                .childHandler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        System.out.println("initChannel ch:" + ch);
                        ch.pipeline()
                                .addLast("decoder", new HttpRequestDecoder())  //1
                                .addLast("encoder", new HttpResponseEncoder())  //2
                                .addLast("aggregator", new HttpObjectAggregator(512 * 1024)) //3
                                .addLast("handler", new HttpHandler());    //4
                    }
                })
                .option(ChannelOption.SO_BACKLOG, 128)
                .childOption(ChannelOption.SO_KEEPALIVE, Boolean.TRUE);
        b.bind(port).sync();
    }
}
